mm: numa: trace tasks that fail migration due to rate limiting
A low local/remote numa hinting fault ratio is potentially explained by
failed migrations. This patch adds a tracepoint that fires when
migration fails due to migration rate limitation.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Alex Thorlton <athorlton@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/trace/events/migrate.h b/include/trace/events/migrate.h
index ec2a6cc..3075ffb 100644
--- a/include/trace/events/migrate.h
+++ b/include/trace/events/migrate.h
@@ -45,6 +45,32 @@
__print_symbolic(__entry->reason, MIGRATE_REASON))
);
+TRACE_EVENT(mm_numa_migrate_ratelimit,
+
+ TP_PROTO(struct task_struct *p, int dst_nid, unsigned long nr_pages),
+
+ TP_ARGS(p, dst_nid, nr_pages),
+
+ TP_STRUCT__entry(
+ __array( char, comm, TASK_COMM_LEN)
+ __field( pid_t, pid)
+ __field( int, dst_nid)
+ __field( unsigned long, nr_pages)
+ ),
+
+ TP_fast_assign(
+ memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
+ __entry->pid = p->pid;
+ __entry->dst_nid = dst_nid;
+ __entry->nr_pages = nr_pages;
+ ),
+
+ TP_printk("comm=%s pid=%d dst_nid=%d nr_pages=%lu",
+ __entry->comm,
+ __entry->pid,
+ __entry->dst_nid,
+ __entry->nr_pages)
+);
#endif /* _TRACE_MIGRATE_H */
/* This part must be outside protection */